I don't think Bednar was to blame for systems, adjustments, gameplans, or any of the other buzzwords, and DeBoer wasn't the reason they lost either.
What I do think Bednar might have played a part in this year's loss was overworking his stars and being too stubborn with the line combos, not playing Marty with Nelson when both struggled nearly all series.
It's understandable not to have switched the lines during/after the Game 6 win, or during the 2-0 lead in game 7, but before that there were definitely opportunities to switch the lines.
But the biggest problem I think was the team flipped the switch off at the end of the regular season, and might not have had the gas in the tank, mentally, and emotionally to turn it back on fully. Not even sure it was physical. I think they didn't have the mental energy to get dialed back in properly after a grueling regular season, that's why they kept making mistakes, and throwing games away. Overworking guys like Nate and Cale, and to an extent Toews, may have contributed to that.
They checked out too hard. It's human nature to an extent. They needed an extended layoff to mentally reset, and the break between regular season and playoffs wasn't enough.
If they need to change the coach, because they don't have any other options, then so be it. I don't think he's the problem at all, but this was an incredibly deflating loss, and they don't have much they can do with the roster.
I don't want a rookie head coach for a top contender though. We've seen that kind of thing with Granato. The NHL is a different beast. They have to learn on the job, and usually get out coached their first playoffs. Can't afford any more lost seasons with this group. Hire Sullivan if you need a new voice.
Whether Bednar is here or not though, the players are the only ones that can figure out this mental hurdle they have in the playoffs, where they stop playing, or get frustrated, and generally just lose focus and throw games away they should win. That's 100% on them. The coach can't help them with that, and he can't play for them.
Figure it out guys.